Can't rebase from Fedora Silverblue 38 into 39

This error message is not letting me rebase from Fedora Silverblue 38 into 39 beta
error: Packages not found: fedora-kickstarts, l10n-kickstarts, spin-kickstarts

I’ve tried “rpm-ostree install fedora-kickstarts l10n-kickstarts spin-kickstarts”, but i got:
error: Package/capability ‘fedora-kickstarts’ is already requested

It appears that you’ve layered those packages, and they’ve been dropped from F39. You need to rpm-ostree uninstall them.

If that doesn’t work, please share the output of rpm-ostree status, at least including the booted deployment (●), and any pending deployment above that.